Sensors are the interface to the outside world. With the help of sensors, many different states can be reliably measured.
The connection to the smart home is realized either by WLAN, 433MHz radio or Zigbee.
Zigbee and 433MHz sensors require a bridge to integrate them into the smart home.
You can choose between a 433MHz wireless bridge or a Zigbee bridge in the store.
Both versions are also offered with the Tasmota firmware.
The sensors can then be easily integrated cloud-free into most smart home applications via the bridge's MQTT protocol. Including: ioBroker, openHAB, FHEM, NodeRed, Home Assistant, Domoticz, among others.